A method for continuously producing high-quality needle coke

Abstract

The invention discloses a method for continuously producing high-quality needle coke. The method mainly comprises the following steps that 1, raw materials are pressurized by a metering pump through aheating furnace tube and then continuously enter a carbonization reactor (high-pressure coke tower), the temperature in the carbonization reactor is maintained to be 400-500 DEG C, feeding continuesfor 10-24 hours, then feeding is stopped, and the reaction continues for 0-18 hours; in the whole carbonization reaction process, high pressure-low pressure alternate pulse operation is used in the carbonization reactor, the reaction pressure changes in the range of 1.0-6.0 MPa; 2, green coke generated at the bottom of the carbonization reactor is removed through hydraulic decoking and dischargedfrom the bottom of the carbonization reactor; 3, the green coke product is calcined at 1450 DEG C for 2-4 hours to obtain the coke. The method is beneficial to formation of needle coke products of theoptical structure in a highly uniaxial orientation fine fiber shape, the interphase content is up to 95% or above, and the CTE, measured at 25-600 DEG C, of a graphite electrode prepared from the needle coke is smaller than or equal to 1.3*10<-6> / DEG C. Meanwhile, the process has the advantages of being simple in process flow, high in operability and capable of achieving continuous production.

Description

technical field [0001] The invention designs the field of high-grade carbon material production technology, especially a continuous process for producing high-quality needle coke. Background technique [0002] Needle coke is a kind of carbon material with many uses. It has a silver-gray metallic luster on the outside. The section of raw coke has a fine fiber-like uniaxial distribution optical texture. Features, high-power electrodes and ultra-high-power electrodes made of it have small resistivity, strong thermal shock resistance, and high mechanical strength. As a high-quality carbon material, it is widely used in electric arc furnace steelmaking. In the smelting industry, the smelting efficiency can be increased by more than 3 times. With the vigorous development of my country's iron and steel industry, the demand for needle coke is also increasing day by day. According to incomplete statistics, my country needs about 200,000 tons of needle coke products every year. However,...

AI Technical Summary

Problems solved by technology

The above-mentioned technology adopts the degassing coke-pulling process to prepare needle coke, and the released gas is defined by the pressure generated by the self-produced gas of the raw material oil. The amount of gas produced is different. For example, the gas amount in the later stage of mesophase development is much smaller than that produced by the violent cracking of raw oil in the early stage of the reaction. In most cases, the shear force generated by the escape of light components in the late stage of development Small, the ideal coke effect cannot be achieved for the bulk mesophase in the system, resulting in the needle coke microstructure unable to achieve uniaxial orientation

In addition, the above two similar patents are both batch processes, and there is currently a lack of a continuous process for producing high-quality needle coke (ie, high mesophase content and highly uniaxially oriented mesophase structure)

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